Implement auto logout

[lyannne]

ℹ️ Issue

Closes #322

📝 Description

Changes made to the code:

1. Added useEffect in authContext.tsx to start/clear the 8 hour timer on login/logout (respectively)
2. Added logout method in backend controller and service to clear cookies
3. Added testing for new backend route

✔️ Verification

What steps did you take to verify your changes work? These should be clear enough for someone to be able to clone the branch and follow the steps themselves.

• I ran the backend with a 1 minute timer to test, and it auto logged me out after a minute!

Test Changes

If your new feature required some test to be changed or added to fit the new functionality or changes please document these changes here.

N/A

🏕️ (Optional) Future Work / Notes

Noticed that /auth/refresh endpoint does not exist for the refresh token; will need to be made in the future.

[Copilot]

Pull request overview

Implements an 8-hour auto-logout mechanism in the frontend auth context and adds a backend logout endpoint/service method to clear auth cookies (and optionally invalidate the Cognito session).

Changes:

• Frontend: adds an 8-hour setTimeout tied to authentication state to auto-trigger logout.
• Backend: adds POST /auth/logout to clear auth cookies and an AuthService.logout() method that calls Cognito globalSignOut.
• Backend tests: adds unit tests for the new AuthService.logout() behavior.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
frontend/src/context/auth/authContext.tsx	Starts/clears an 8-hour timer based on isAuthenticated to auto-call logout()
backend/src/auth/auth.service.ts	Adds a logout service method that attempts Cognito globalSignOut
backend/src/auth/auth.controller.ts	Adds POST /auth/logout to clear cookies and attempt Cognito session invalidation
backend/src/auth/test/auth.service.spec.ts	Adds unit tests for AuthService.logout()

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